The park remains open, and visitors are not at risk, fire bosses fighting the Spruce Lake and Blanket Creek fires said in a briefing.

"Crater Lake National Park and all concessions remain open and welcome visitors," fire managers said. "Alternate routes and activities are available to enjoy the Park."

But West Rim Drive is closed from Munson Valley Road to North Junction.

The Pacific Crest Trail is closed from Dutton Creek Trail north to the North Entrance road.

Other trail closures include:

Rim Trail from Discovery Point to North Junction

Boundary Springs Trail

Bald Crater Loop Trail

Bert Creek Trail

Lightning Springs Trail

Discovery Point Trail

The fire is estimated at 3,600 acres and 5 percent contained.

There are 197 people working the fire.

Firefighters anticipate another long, hot day as the fire continues to challenge containment.

"Today’s weather will again be abnormally hot and dry, with afternoon winds gusting to 20 mph," managers said in a briefing. "The prolonged hot, dry weather pattern is continuing to influence the progression of the fire. As the days heat up, the fire produces a large smoke plume carrying fire brands that are transported by the prevailing westerly winds, creating spot fires up to a mile in front of the main fire front, and continue that progression on an easterly path."

The fire is under siege by the same team fighting the nearby Blanket Creek Fire.

That fire is 3,000 acres and 9 percent contained with 743 personnel assigned.